Pumping apparatus for musical instruments



M. S. WRIGHT.

PUMPING APPARATUS FOR MUSICAL INSTRUMENTS.

APPLICATION FILED APR. 8. 191 5- Patented J 11116 17, 1919.v

4 SHEETS-SHEET I.

M. s; WRIGHT. v Fl JMPRNG APPARATUS FOR MUSICAL INSTRUMENTS.

APPLICATION FILED APR. 3,1915.

Patented June 17, 191&

4 S HEETSSHEET 2.

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@Z W Grier/14mp M. S. WRIGHT.

PUMPING APPARATUS FOR MUSICAL INSTRUMENTS.

APPLICATION FILED APR.B. I9I5. 1 ,306,937. Patented June 17, 1919..

4 SHEETSSHEET 3.

3mm mtoz I M. S.-WRIGHT.

PUMPING APPARATUS FOR MUSICAL LNSTRUMENTS.

APPLICATION HLED APR. 8.1915. J 1,306,937. I Patented June 17, 1919.

4 SHEETS-SHEET 4.

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MORRIS S. WRIGHT, 0F WORCESTER, MASSACHUSETTS.

rumrmenrrnnarus non MUSICAL INSTRUMENTS.

To all whom it may concern Be it known that I, MORRIS S. WRIGHT, citizen of the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Pumping Apparatus for Musical Instruments, of which the following is a specification, reference being had therein to the acompanying drawin This invention relates to self playing musical instruments, and more particularly to air exhausting mechanism for devices of this character.

In self-playing musical instruments I have found it highly desirable to govern the action of the feeders or exhausting mechanism in accordance with the demand in the actual working of the instrument, and it is the primary object of the present invention to provide a highly efficient and satisfactory means for accomplishing this result. In inhard all the time,

struments of the character under consideration, especially those wherein is employed a motor for operating the exhausting mechanism, it has been largely the practice to control the air tension through the medium of safety or relief valves, and while devices of this character have proven satisfactory to a large extent, the motor iscompelled to work and is thereby subjected to undue strain, wear and tear, regardless of the actual demands of the instrument on the exhausters, andit is also found that the escape of air by way of the relief valves or similar devices makes. a disagreeable noise, quite objectionable in instruments of this character.

The present invention aims to overcome the above noted difficulties and objections relative to noise and ov'ertaxing of the motor, when little or no work is required and the likelihood of the-motor to burn out, and includes mechanism for automatically vary-- ing the movement or stroke of the exhausting mechanism according to the actual demands placed thereupon in the operation of mechanism, to vary the instrument.

In carrying out the principle of the invention, I preferablyvprovide, in operative association with the exhausting mechanism,

a pneumatic control automatically operating through the medium of the exhausting the movement of the latter. v

While the invention includes a wide range of means for accurately varying the stroke Specification of Letters Patent. Application filed April 8, 1915. Serial No. 20,062.

Patented June 17, 1919.

terrupting the movement of, or straining the motor, should the latter be employed, and numerous modifications are within the spirit and contemplation of the invention, a pre ferred means for accomplishing this result includes a lever operatively associated with the exhaustin mechanism, and means 0peratively assoclated with said lever for regulating the movement thereof whereby to vary the throw of the exhausting mechanism.

he invention also contemplates improved means for operating the the preferred embodiment of the invention illustrated, this means includes an actuating lever connected to the exhausting mechanism and an adjustable fulcruming means for the lever whereby to vary the movement thereof, and regulate the throw of the exhausting mechanism.

Still other improvements and novel details in the construction and arrangement of the various parts of the invention will be appreciated from the description to follow, which, for a clear understanding of the invention, is to be considered in connection with the accompanying drawings, which form a part hereof, and wherein is shown, for the purpose of illustration, a convenient and satisfactory embodiment of the invention.

In the drawings Figure l is a side elevation of my device;

Fig. 2 is a vertical longitudinal sectional view, taken through the bellows;

Figs. 3 and 4 are elevations looking from opposite ends of the device;

mechanism removed, and

Fig. 6 is a horizontal sectional view taken through the bellows air chamber, with certain parts below the same removed.

With more particular reference to the drawings, wherein like reference numerals refer to correspondin parts throughout the several views, a suita le frame is provided, the same preferably having upright supports or bars 1 positioned on a base or bed 2. Said frame is preferably hollow and connected to the upright supports adjacent the upper end thereof are suitable horizontally disposed brace bars 3, adapted to support exhausting mechanism, which latter preferably lake the form of exhausting or feeding bellows. Conveniently four of such exhausters, and in Fig. 5 is a top plan view with the bellows feeders are illustrated, the same being ar- .ranged in two superimposed airs. The lowermost pair of exhausting ellows or feeders conveniently comprise lower stationary walls 4 and 4*, respectively, positioned upon a support 5 secured to the-horizontally disposed brace bars 3, and movable walls 6 and 6*, respectively, the movable walls bein connected to the stationary walls asby fiexi le folds 7 and. 7*, respectively. Springs 8 and 8 respectively, may be employed, s'aid springs being connected at one end to a movable wall, and at the opposite end to a fixed wall of the bellows.

Projecting upwardly from the horizontal brace members 3 are suitable upright supports 9, secured to the latter, and supported thereby are the upper pair of exhausting bellows, comprising a lower stationary wall,-

' scribed.

A suitable air chamber 14 is arranged adjacent one end of the bellows,- and in communication therewith through the medium of ports 15. A suitable regulating bellows, of any desired construction 16, 1s preferably wall of the air chamber 1 1, and at its opposite and to the I upright-supports 9 'as through the medium of screws or the like 17. This regulating bellows is in commun cation withzthe alr chamber 15 at its rear end, as

f through the medium of one or more ports 18. The air chamber 14 is adapted tobe connected as by a pipe or conduit 19, with the usual vacuum chamber, ,wind chest, pressure chamber or the like illustrated diagrammatically 'at*19. Y

v In the preferred embod ment of the inventionthje exhausting mechanism or feeders is power actuated, and to this end a'smtable 'motorl conveniently an electr c motor, v2O, 1s

provi ed,1the' same being supported upon the base 2,-as'illustrated, and *havin a dr1ve shaft" 2 ;1,',=conveniently flexible, which latter 1.,has'atonef'end a worm 22, .adapted to mesh with agwormigear 23, whereby to rotate a I shaft 24, mounted upon sultable bearlngs 25,

loo

' supported from the base ,2. 'i

Said. haft 24 referablyhas means for impartin movement to pitman members, operative y associated with the movable wall of the exhausting bellows, there being a pita man for each bellows, and the operative connection bet 'een each' pitman and the shaft, in the illust ation, being constructed as follows? r 1 Metallic diskshaped plates are secured upon the shaft 24, there preferably being three of s i ch lates upon each side of the gear 23,

supported at one end upon the top and a description of one series of plates will suflice for the other. These plates are illustrated at '26, '27 and 28.

Projecting between the center plate 27 and theouter plate 26 is a suitable pin 29, said pinbeing adjacent one portion of the periphery of said plates, and projecting between said center late 27 and the outer plate 28 is a pin 30, 'sald pin being secured adj acent a different portion of the periphery,

whereby the pitmen 31 and 32, mounted upon said pins, will alternately operate. 1

It will be appreciated that there is a pitman for each of the exhausting bellows, and

that, the number of these various parts may be changed at will to suit the requirements.

Oneof said pitman rods 31 is adapted for connection with the movable wall of one of the lower bellows'whereas the other rod 32 is adapted for connection with the movable Wall of one of the upper exhaust bellows, and the operative connection between these parts preferably includes an elongated lever 33, conveniently of metallic construction, said lever havin a loose connection, as indicated at 34, witht e upper end of the adjacent pitman rod and at its opposite end with the vertically-disposed actuating rod 34*, which latter has'a loose connection at its upper end as through the medium of a bracket 35 with the movable. wall of the adjacent exhaust/' bellows.

The respectivelevers 84, it will be appreclated, are arranged side by side, and an intermediate bearm or fulcrum is provided for said levers, sai bearing or fulcrum being in the instance illustrated common to all of said levers. Said fulcl um 'or bearing preferably includes a supporting fram 35, preferably in the form of a truck or carriage and having adjacent opposite sides thereof suitable roller bearings 36, adapted to engage runways or tracks 37, supported from the framework of the instrument.

Mounted upon the truck or carriage 35,

as by brackets 38, is a transversely extending shaft 39, and sleeved upon said shaft for ro- "tatable movement are a series of anti-fric-' tion rollers 40, one for each of the levers '33, whereby to engage the latter at a point intermediate the ends thereof, so as to constitute a fulcrum.' Conveniently, the levers 33 have a cut out port 33*,fadapted for the re v ception of a layer of non-metallic material such as fiber, whereby to form an anti'friction and noise deadening surface to engage the rollers 40. 4

It will be noted that the truck or carriage 35 is adjustable longitudinally relative to the levers 3 3 and when in one position of adjustment, the fulcrum provided by the rollers 40 will permit said lev'ersto have a full stroke soas to permit of the movable wall of the connected bellows to have a full stroke The motors being continuously opnected at one end to crating, and the demand on the exhausting llows not bein the same at all times, it is desirable to shit t the fulcrum provided by the rollers 40 to -the end that the movement of the levers 33 and the stroke of the exhausting bellows may be accurately adjusted to suit the actual requirements, and with this object in view, mechanism is provided for automatically shifting the truck or carturn the fulcrum rollers 40, 1n accordance with the condition of the air tension or pressure in the air chamber at any particular time in the working of the instrument.

In carrying out this idea, a suitable pneumatic or bellows 41 is mounted upon the side Wall of the air chamber 14, said bellows 41 being in communication withsaid air chamber as through the passages 42. Connected to the outer movable wall 41 of the bellows 41 which may be termed a governor pneumatic, is a depending bracket, conveniently of U-shaped wire construction, 43, to which is connected an elongated horizontally disposed actuating rod 44, which latter has a sleeved connection 45 with the loop of the its opposite mounted on the truck he position or movement of the movable wall 41 of the governor pneumatic 41 is of course controlled by theair tension or pres sure, and any movement of course, result in an adjustment of the fulcrum 40, to the end that the degree of movement of the levers 33 and the stroke of the exhausters are thereby regulated.

It is desirable to prevent the levers 33 from moving lengthwise or floundering about,so to speak,and a preferred means for so retaining the levers in place, especially during the adjustment of the fulcrum, is illustrated, the same taking the form of an elongated, curved, supporting member or bar 48, pivotally connected at one end to the lever adjacent the pitman end thereof, said connection being conveniently formed as by a pin on the bar 48, engaging in a sleeveextension49, of the lever.

The supporting bar 48 has, at its opposite end, a lug or pin 50, adapted to engage in an aperture 51, in the lower end of one arm of a U-shaped bracket 52. A suitable leaf spring member 53, secured at one end to the bar 48, and apertured at its outer end to engage over the free end of the lug projecting through the arm of the bracket, is adapted to detachably retain the bar 48 in place. is understood. of course, that there is provided a bar 48 for each of the levers 33, adjacent bars of each pair of levers being conthe respective arms of the U-shaped bracket 52, as illustrated more particularly in Fig. 5.

From the construction, it is believed the of said 'wall will,

operation will be in the art.

Assuming that the motor is started, the exhausters commence to cause a vacuum, and as the governor pneumatic 41 collapses, the fulcrum 40 is moved from the crank end of the levers 33, so that when little or no air is being used, except to supply the natural leaks, the exhausters are making only air enough to take care of the leaks. As more air is'used, the governor pneumatic opens. thereby moving the fulcrum 40 rearwardly so that the lever is thereby given more motion, and therefore more air will be exhausted. In action, it is found that the stroke of the exhausters is thereby regu lated automatically, and accurately, under all conditions. For instance, in self-playing pianos, should more than one note he struck. and then instantly ten or twenty, the action of the exhausters is so quick and positive that it will make the amount of air needed and thereupon cease to make more. In this Way, the instrument is rendered quite accurate and quiet in operation; the bellows can obvious to thoseskilled or burned out, as the case may be, for the obvious reason that when there is little or no air being used the motor will be put to very little work.

While the invention has been more particularly described for use in connection with self-playing musical instruments, at the same time it is to be borne in mind that the invention is susceptible of a wide range of uses and adaptations, and may be satisfactorily employed in connection with pumps or similar devices for maintaining air or vacuum, and it is within the spirit and contemplation of my invention to cover the adjusting mechanism illustrated and described in connections other than self-playin'g musical instruments. Therefore, in the claims, it is to be noted that wherein there occurs such expressions as In a self-playing musical instrument, this expression is to be construed not by way of limitation. but as referring to similar instruments or devices Wherein the invention might be utilized to advantage.

It is also to be borne in mind that the invention. while illustrated in connection with exhausting bellows or vacuum creating means, the same principle might be applied to instruments wherein are employed force bellows, or in connection with such instruments wherein both force and vacuum are employed, and such obvious changes are within the scope and spirit of the invention.

What I claim is 1. The combination with a wind chest or vacuum chamber of a self-playing musical instrument, of air exhausting mechanism, and connected mechanism for automatically 'hausting instrumentalities,

arying the stroke of said air exhausting mechanism, according to the actual demands of the instrument.

2. The combination with a wind chest or vacuum chamber of a musical instrument, of an exhausting bellows therefor, a power drive for the latter, and operatively associated connected mechanism for varying the stroke. of the movable wall of the bellows, according to the actual demands of the instrument.

3. The combination of a vacuum chamber of a self-playing musical instrument, exincluding a bellows, means for changing the extent of movement of the movable wall thereof, and pneumatic means operated by the exhausting instrumentalities for governing the movement of said movement changing means.

4. The combination of a vacuum chamber or wind chest of a self-playing musical instrument, air exhausting mechanism having a movable wall, a stationary power drive, operative connections between the power drive and the movable wall of the exhausting means, and means for adjusting said connection whereby to regulate the movement of said wall.

5. The combination of a vacuum chamber of a self-playing musical instrument, an exhausting bellows having a movable wall, and means for moving the same includmg a lever, and means for adjusting the movement of the lever. a p

6. The combination of a vacuum chamber of a self-playing musical instrument, an exhausting bellows having a movablewall, and means for moving the same including a lever, and bellows control means for ad usting the movement of the lever.

7. In combination with a vacuum chamber of a musical instrument, an exhausting bellows therefor having a movable wall, means for moving the same including a lever, and an, adjustable fulcrum to be engaged by said lever and unconnected therewith.

8. In combination with a vacuum chamber of a musical instrument, an exhausting bellows itherefor having a movable wall, means for moving the same including a lever operatively connected therewlth at one end and having a dIlVlIlg connectlon at its opposite end, ends of the lever adapted to be loosely engaged thereby. and means whereby the fulcrum may be adjusted.

9. In combination with a vacuum chamb of a musical instrument, an exhausting bellows therefor having a movable wall, and means for moving the same including a lever, and an independent movable fulcrum constituting an adjustable hearing or support intermediate the ends of the lever.

10. In a self playing musical instrument,

a fulcrum intermediate the the combination of an exhausting bellows having a movable wall, and means for moving the same including .a lever, a movable fulcrum constituting an adjustable bearing or support intermediate the ends of the lever, and a supporting guide member pivoted at one end to a fixed support and operativelyconnected to said lever for limiting the movement of the lever.

11.- In combination with a vacuum chamber of a musical instrument, an exhausting bellows therefor ,having a movable 'wall, means for moving the same including a lever, a supporting bearing, said lever loosely engaging said bearing intermediate its ends, and means whereby said bearing may be adjusted to vary the throw of the lever.

12. In combination with a vacuum chamber of a musical instrument, an exhausting bellows therefor having a movable wall, means for moving the same including a le- 'ver, a supporting bearing, said lever loosely engaging said bearing intermediate its ends, and automatic means for moving said bearing independent of the lever whereby the throw of the latter may be regulated.

18. In combination with a vacuum (311511111 ber of a musical instrument, an exhausting bellows therefor having a movable wall, means for moving the same including a lever, a supporting bearing, said lever loosely engaging said bearing intermediate its ends, automatic means for moving said bearing independent of the lever whereby the throw of the latter may be regulated, and means for maintaining said lever in place during the adjustment of the bearing.

14. In a self playing musical instrument, the combination of an exhausting bellows having a movable wall, an elongated lever operatively connected at one end to said movable wall, driving means operatively connected to the opposite end of said lever, means forming a fulcrum intermediate the ends of the lever, and a movable truck or carriage for the fulcrum.

15. In a self playing musical instrument, the combination of an exhausting bellows having a movable wall, an elongated lever operatively connected at one end to said movable wall, driving means operatively connected to the opposite end of said lever, means forming a fulcrum intermediate the ends of the lever, a movable truck or carriage for the fulcrum, a pneumatic, and connections between the pneumatic and said truck or carriage.

16. In a self playing musical instrument, the combination of an exhausting bellows having a movable wall. an elongated lever operatively connected at one end to said movable wall, driving means operatively connected to the opposite end of said lever, means operatively associated with the lever of a self pl-aylng musical instrument, of an support, and

ing a lever having a v for limiting for adjusting the movement thereof, andoperatively connected at one end to said movable wall, driving means operatively connected to the opposite end of said lever, means operatively associated with the lever for adjusting the movement thereof, and a swinging guide arm supporting the lever. 18. The combination with a vacuum chamber of a musical instrument, of an exhausting bellows having a movable wall, driving connections for imparting movement thereto, a pneumatic operatively associated with said vacuum chamber and controlled thereby, and means controlled by the pneumatic for adjusting said connections whereby to regulate the action of said movable wall.

19. The combination with an air chamber exhausting bellows having a movable wall, driving connections for imparting movement thereto, a pneumatic, connections between the movable wall of the pneumatic and 'the movable wall of the bellows, said connections being governed by the pneu matic to vary the stroke of the movable wall of the bellows.

20. The combination with an air chamber of a self-playing musical instrument, of an exhausting bellows having a movable wall, drivin connections for imparting movement t ereto, including a lever having a fulcrum support intermediate its ends, a pneumatic and a truck carrier actuatedby the latter for adjusting said fulcrum support.

21. In a self playing musical instrument, the combination of an exhausting bellows having a movable-wall, driving connections for imparting movement thereto, includfulcrum support intermediate its ends, a pneumatic, means actuated by the latter for adjusting said fulcrum a swinging support for said lever. j i

22. In a self playing musical instrument, the combination of "an exhausting bellows having a movable wall, driving connections for imparting movement thereto, including a lever having mediate its ends, a movable arm support the movement of the lever, a pneumatic aving arm having connection at one end to the movablewall of the neumatic and at its opposite end with t e fulcrum support whereby to adjust the latter.

23. In a self playing musical inst ent, the combination of an exhausting bellows having a movable wall, driving connections for imparting movement thereto, including a fulcrum support intera movable wall, and an a lever having a fulcrum support intermediate its ends,-a pneumatic having amovable wall, an arm ,having connection at one end to the movable wall of the pneumatic and at its opposite end with the fulcrum support whereby to adjust the latter, and a pivoted support for said lever to limit its movement in one direction.

24. In a self playing musical instrument, the combination of an exhausting bellows having a movable wall, a drive shaft, a pitman operated by the latter, a lever operatively' connected at one end to the pitman and at its opposite end to the movable wall of the bellows, and a slidably mounted fulcrum upon which the lever rests intermedi- -ate its ends, whereby the movement imparted thereto by the pitman may be adjusted.

25. The combination with a vacuum chamber Wind chest of a musical instrument, of an 'exhaustin bellows in operative association with sai chamber and having a movable wall, a drive shaft, a pitman operated by the latter, a lever operatively connected at one end to the pitman and at its opposite end to the movable wall of the bellows, an adjustable fulcrum support for the lever,

and a guide for said support.

26. In a self playing'musical instrument,

the combination of an exhausting bellows having a movable wall, a drive man operated by the latter, a lever operativelyconnected at one end to the pitman, and at its opposite end to the movable wall of the bellows, 'an adjustable support for the lever, and a pivoted support for the lever.

27. In a self playing musical instrument, the combination of an exhausting bellows having a movable wall, a drive shaft, a pitman operated by the latter, a lever operatively connected at one end to the pitman and at its opposite end to-the movable wall of the bellows, an adjustable support for the lever, a runway for the support, and pneumatic control means for adjusting said support.

28. In a self playing musical instrument, the combination of an exhausting bellows shaft, a pit- .having a movable wall, a drive shaft, a pitman operated by the latter, a, lever operatively connected at one end to the pitman and at its opposite end to the movable wall of the bellows, and an anti-friction adjustable fulcrum engaging the lever intermediate its ends.

- 29. In a self playing musical instrument, the combination of an exhausting bellows having a movable wall, a drive shaft, ap1t-' man operated by the latter, a lever operatively connected at one end and at its opposite end to the movable wall of the bellows, and an anti-friction ad ustable fulcrum engaging the lever intermediate its ends, and sand lever ha an anti-frictlon surface to engage said fu crum.

to the pitman 30. In a self playing musical instrument,

' the combination of an exhausting bellows, a

lever, operative connection between one end of the lever and the movable wall of the bellows, driving means for the opposite end of said lever, said lever having a non-metallic surface, and an adjustable fulcrum to' engage said surface.

' 31. In a pneumatic action for musical. instruments, the combination of an exhausting bellows having a movable wall, a lever extending longitudinally of the exhaust bel-:

' lows, a rod connecting one end of the lever with the movable wall of the bellows, a fulcrum roller to engage the lever intermediate its ends, means engaging the opposite end of the lever tomove the same about said fulj crum, and a pivoted supporting bar connected to said lever.

32. In a pneumatic action for musical instruments, the combination of an exhausting bellows having a movable wall, a lever ex-.

I tending longitudinally of the exhaust bellows, a rod connecting one end of the lever with the movable wall of the bellows, a fulcrum support to engage the lever intermediate its ends, means engaging the opposite latter.

end of the lever to move the same about said fulcrum, and a member pivoted at one end to a fixed support and at its opposite end to said lever adjacent the driving means for 33. In a pneumatic action for musical inf struments, the combination of an exhausting tending longitudinally of .the exhaust belbellows having a movable wall, a lever exlows, a rod connecting one end of the lever with the movable wall of the bellows, a fulstruments, the combination'of an exhausting crum support to engage the lever intermediate its ends, a truck carrier for the support, a .pitman connected to the opposite end of the lever, and driving means for the pitman.

34. In a pneumatic action for musical inbellows having a movable wall, a'lever extending longitudinally of the exhaust bellows, a rod connecting one end of the lever with the movable wall of the bellows, a

I guideway, and a slidable fulcrumsupport on said guideway to engage the lever intermediate its ends, and a power drive operatively connected to the opposite end of the lever.

tending longitudinally 'of the exhaust bel- 35. In a pneumatic action for musical instruments, the combination of an exhaustlng bellows having a movable wall, a lever exlows, a rod connecting one end of the lever with the movable wall of the bellows, a fulcrum roller to engage the lever intermediate its ends, a power drive operatively connected to the opposite end of the lever, and means for adjusting said fulcrum.

. 36. In a pneumatic action for musical in- I struments, the combination of an exhausting es bellows having a movable wall, a lever exthe tending longitudinally of the exhaust bellows, a rod connecting one end of the lever with the movable wallof the bellows, an adjust-able fulcrum support to engage the lever intermediate its ends, a motor, a pitman con-.

nected to the opposite end of the lever, a

crank drive for the latter, and gear connection between said drive and the motor.

37 In a self playing musical instrument,

the combination of an exhausting bellows, and operating means for the latter including an elongated lever having at one end operative connection for the movable wall of the bellows, a pitman connected to the opposite end of-the lever, driving means for the latter, an adjustable fulcrum bearing intermediatetheends of the lever, and a movable supporting member connected at one end to a fixed'support and at its opposite end t ,said lever.

38. The combination of a fluid chamber of amusica'l instrument, a regulating bellows operatively associated therewith, a motor, driving connection between the motor and said bellows, and 'means acting automatically to adjust the movement of said bellows regardless of the speed of the motor.

39. The combination with the vacuum chamber of a self-playing musical instrument, of a plurality of vacuum pumps collectively associated. for exhausting air, a

motor for operating the pumps s1multathe exhausting bellows according to the tension of the air chamber.

41. The combination with the vacuum chamber of a self-playing musical instrument, of a vertically disposed bellows exhausting pump operatively associated with said chamber, a horizontally disposed actuating lever for the movable wall of the pump, a fulcrum intermediate the ends of the lever constituting a rest therefor, a mo 'tor drive for said lever, and automatic means for moving. said fulcrum horizontally. 42. The combination with the vacuum chamber of a self-playing musical instrument, of a 'vertically disposed bellows exhausting pump operatively. associated with said "chamber, a horizontally disposed actuating lever for the movable wall of the the lever constituting a rest therefor, a motor drive fer said lever, automatic means for movmg said fulcrum horizontally, and a pump, a fulcrum intermediate the ends of I horizontally disposed runway for the fulating lever for the movable wall of the pump, a fulcrum intermediate the ends of the lever constituting a rest therefor, a motor drive for said lever, automatic means for moving said fulcrum horizontally, a hori zontally disposed runway for the fulcrum, and a. swinging arm suppport for the lever.

44:. The combination of an air chamber for a self-playing musical instrument, an

exhausting pump having a movable wall, an

elongated lever operatively connected at one end of said movable wall, driving means op eratively connected to the opposite end of said lever, a runway, and a slidably mount ed fulcrum on said runway for the lever intermediate its ends.

45. The combination with an air chamber of a self-playing musical instrument, of an exhausting bellows having a movable wall, an elongated lever operatively connected at one end to said movable wall, driving means operatively connected to the opposite end of said lever, and a swinging guide arm supporting the lever.

a6. In combination with the vacuum chamber of a self-playing musical instrument, of an exhausting bellows having a movable wall, a fulcrum, a horizontally disposed lever resting upon the fulcrum intermediate its ends so as to tilt vertically said lever being operatively associated with the bellows at one end, driving means for the opposite end of the lever, and means for adusting said fulcrum.

47. In combination with the vacuum chamber of a self-playin musical instrument, of'an exhausting ellows'having a movable Wall, a fulcrum, a horizontally disposed lever resting upon the fulcrum inter mediate its ends so as to tilt vertically, said lever being operatively associated with the bellows at one end, driving means for the opposite end of the lever, and. means for adjustin said fulcrum, sald means being automatically controlled by the air tension in the system.

48.- In combination with the vacuum chamber of a self-playing musical instrument, of an exhausting bellows having a. movable wall, a fulcrum, a horizontally disposed lever resting upon the fulcrum inte mediate its ends so as to tilt vertically, said lever being operatively associated with the bellows at one end, driving means for the MORRIS s. WRIGHT.

Witnesses:

FRANCES G. DEE, CLIFFORD L. WRIGHT. 

